Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd023d175912959a…

MALICIOUS

PDF

69.7 KB Created: 2021-03-28 18:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2db58c2b4d7a2f034c8eeb8485790ebb SHA-1: ae06cb5dc128a91cdf7cc22f77a4c583056ec9ac SHA-256: cd023d175912959aa70ac7b1ec3ddceeed883c4b825098ca732d7005972a0c20
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=breast+cancer+symptoms+in+tamil+pdf PDF link annotation
    • http://mogimetekojubar.scienceontheweb.net/buguridimuwobeduxujo.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hhfijjj/invaders_mc_cedar_lake.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/zYhhNhi/kukebejaderewigolutomuba.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/neoliberalismo_que_es.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/pandoc_html_to_page_break.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/what_is_development_biology_embryo.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/shcYhcP/42865867056.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/jhhggig/cooking_mania_food_fever_restaurant_crazer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffe0341-06d5-49e1-a876-a21ed7fa11e8/87425696698.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_dd394d58f6064ab882489cd2d4989e43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae43e6f3-0b86-4236-baab-d0ff26773ea6/74771154425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563e94a6-9422-4908-bd94-a6829b060286/tufugefugubi.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/celebrate_recovery_step_study_lesson_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75257af5-d2ae-44c7-8802-7427c6680401/matodebip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da06cd51-7f45-48a2-9392-e08367f55a81/how_to_apply_two_stage_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0402bf50-8352-461d-be24-51e3a63e28b8/is_chicago_double_spaced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3f2808-8417-46b4-92e4-88ae301ea69d/79193058351.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_a90f037e99954d4482aa244a9bacc639.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7d33b2-f796-4840-859c-a082b7e60114/lexixojetujenejom.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_3a0bad8ef6f14ff8b7033cf18d159495.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/508c2592-f162-4a61-9f33-043a7c444726/how_much_do_uk_lawyers_make.pdfIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 5452 bytes
SHA-256: 005e2d9a41c1296dac2bcaccbc82f114e8d248b9778a34d2562fcb708fc7b131
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10112 bytes
SHA-256: 91b7a53af94c8cbb6f232fbb409e17d8a5ab72a8581b3fa9cb229535f1173568